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</div><hr /><div id="amqpqueue.nack" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">AMQPQueue::nack</h1>
  <p class="verinfo">(PECL amqp &gt;= Unknown)</p><p class="refpurpose"><span class="refname">AMQPQueue::nack</span> &mdash; <span class="dc-title">Mark a message as explicitly not acknowledged.</span></p>

 </div>

 <div class="refsect1 description" id="refsect1-amqpqueue.nack-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="modifier">public</span> <span class="type"><span class="type void">void</span></span> <span class="methodname"><strong>AMQPQueue::nack</strong></span>
    ( <span class="methodparam"><span class="type">string</span> <code class="parameter">$delivery_tag</code></span>
   [, <span class="methodparam"><span class="type">string</span> <code class="parameter">$flags</code><span class="initializer"> = <strong><code>AMQP_NOPARAM</code></strong></span></span>
  ] )</div>

  <p class="para rdfs-comment">
    Mark the message identified by <em><code class="parameter">delivery_tag</code></em> as explicitly not acknowledged. This method can only be called on messages that have not yet been acknowledged, meaning that messages retrieved with by <span class="methodname"><a href="amqpqueue.consume.html" class="methodname">AMQPQueue::consume()</a></span> and <span class="methodname"><a href="amqpqueue.get.html" class="methodname">AMQPQueue::get()</a></span> and using the <strong><code>AMQP_AUTOACK</code></strong> flag are not eligible.
  </p>
  <p class="para">
    When called, the broker will immediately put the message back onto the queue, instead of waiting until the connection is closed.
  </p>
  <p class="para">
   This method is only supported by the RabbitMQ broker. The behavior of calling this method while connected to any other broker is undefined.
  </p>
 </div>


 <div class="refsect1 parameters" id="refsect1-amqpqueue.nack-parameters">
  <h3 class="title">参数</h3>
  <dl>

   
    <dt>
<em><code class="parameter">delivery_tag</code></em></dt>

    <dd>

     <p class="para">
      The delivery tag by which to identify the message.
     </p>
    </dd>

   
   
    <dt>
<em><code class="parameter">flags</code></em></dt>

    <dd>

     <p class="para">
      A bitmask of flags.
     </p>
    </dd>

   
  </dl>

 </div>


 <div class="refsect1 errors" id="refsect1-amqpqueue.nack-errors">
  <h3 class="title">错误／异常</h3>
  <p class="para">
   Throws <strong class="classname">AMQPChannelException</strong> if the channel is not open.
  </p>
  <p class="para">
   Throws <strong class="classname">AMQPConnectionException</strong> if the connection to the broker was lost.
  </p>
 </div>


 <div class="refsect1 returnvalues" id="refsect1-amqpqueue.nack-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
    成功时返回 <strong><code>TRUE</code></strong>， 或者在失败时返回 <strong><code>FALSE</code></strong>。
  </p>
 </div>



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